Select the correct statement about population growth.

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Population density will always increase whenever the number of births is more than the number of deaths.

Natality and mortality contribute to an increase in population density while immigration and emigration contribute to a decrease.

Under normal conditions, births and deaths are the most important factors influencing population density.

Since resources for growth for most animal populations are finite, the exponential growth model is considered a more realistic one.

answer is C.

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Detailed Solution

Under normal conditions, births and deaths are the most important factors influencing population density. Immigration and emigration assume importance only under special conditions. For example, if a new habitat is just being colonised, immigration may contribute more significantly to population growth than birth rates.

Population density will increase if the number of births plus the number of immigrants (B + I) is more than the number of deaths plus the number of emigrants (D + E).

Natality and immigration contribute to an increase in population density while mortality and emigration contribute to a decrease.

Since resources for growth for most animal populations are finite and become limiting sooner or later, the logistic growth model is considered a more realistic one.

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